EP0005599A1 - Zweiweg Trocknungsfilter - Google Patents

Zweiweg Trocknungsfilter Download PDF

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Publication number
EP0005599A1
EP0005599A1 EP79300740A EP79300740A EP0005599A1 EP 0005599 A1 EP0005599 A1 EP 0005599A1 EP 79300740 A EP79300740 A EP 79300740A EP 79300740 A EP79300740 A EP 79300740A EP 0005599 A1 EP0005599 A1 EP 0005599A1
Authority
EP
European Patent Office
Prior art keywords
filter
valve
drier
pad
line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP79300740A
Other languages
English (en)
French (fr)
Other versions
EP0005599B1 (de
Inventor
Ernest W. Schumacher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CNA Holdings LLC
Original Assignee
Virginia Chemicals Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Virginia Chemicals Inc filed Critical Virginia Chemicals Inc
Priority to AT79300740T priority Critical patent/ATE1178T1/de
Publication of EP0005599A1 publication Critical patent/EP0005599A1/de
Application granted granted Critical
Publication of EP0005599B1 publication Critical patent/EP0005599B1/de
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/12—Devices for taking out of action one or more units of multi- unit filters, e.g. for regeneration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
    • B01D35/15—Bidirectional working filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/003—Filters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S210/00—Liquid purification or separation
    • Y10S210/06—Dehydrators

Definitions

  • This invention relates to filter driers.
  • Filterr driers may be used for purifying the liquid refrigerant in a heat pump system.
  • Heat pump and refrigeration systems in which flow in the high-pressure liquid line of the system is reversed when the system is changed from heating to cooling, cooling to defrost or vice versa, are becoming of growing importance.
  • two filter-driers are normally combined with external check valves so that flow through each filter-drier is always in the same direction.
  • the reason for such unidirectional flow is to enable a filter-drier properly to perform its filtration function at all times, because if the flow in the unidirectional device is reversed,some of the solid contaminant retained in the filter media can and will be flushed back into the system.
  • Devices which utilize a plurality of check valves include U.S. 3,299,661 for a checkrvalve manifold, containing three spherical balls which combine the function of four check valves in a bi-directional heat pump system that enables flow into the expansion valve to be unidirectional, regardless of the position of the reversal valve.
  • U.S. 3,311,454 describes a testing apparatus which includes a holding chamber between a pair of top and bottom portions and a centrally disposed tube of transparent material with a pair of ball check valves at the ends thereof.
  • U.S. 3,731,678 describes a respirator for removing smoke and noxious fumes from air before inhaling thereof. It comprises a casing filled with absorbent material and a coaxially disposed conduit which is closed at its lower end by a flapper-type exhalation check valve. A flapperatype inhalation check valve also covers the air outlet openings from the casing.
  • U.S. 4,045,977 describes a selfaoperating excess refrigerant storage system for a heat pump.
  • This system includes an expansion valve, a filter-drier, and a unidirectional check valve which bypasses the expansion valve.
  • a filter-drier comprising a shell having line connectors at each end thereof, an adsorption unit comprising an adsorption space, a valve assembly and a pad assembly at opposite ends.of the adsorption space, and retaining means for positioning said adsorption unit within said shell
  • each said valve assembly comprising a valve bushing having a passageway therethrough and a check valve within said passage for allowing flow of liquid therethrough only from one said line connector toward said adsorption space
  • each said pad assembly comprising: a filter pad positioned between the nearer valve bushing and said shell to filter liquid flowing from the adsorption space to a line connector, a filter pad support means for positioning and supporting said filter pad, and a diaphragm adapted to prevent flow through the filter pad in the direction permitted by the nearer check valve and to permit flow through the filter pad in the opposite direction thereto.
  • the filter-drier may be of the reverse-discharge or separate-discharge type.
  • the reverse-discharge type the flow in each direction takes the same path through the line connectors.
  • a discharge line is provided separate from the line connector to receive flow through the filter pad from the adsorption space.
  • liquid from a compressor 5 is distributed by a 4-way valve 6 either (a) back to the input of the compressor 5 through an accumulator 7 or (b) through an outdoor coil 8 and an indoor coil 9 in either direction.
  • Liquid flow from the outdoor coil 8 to the indoor coil 9 is cooling flow in order to provide heat-exchange liquid for expanding within indoor coil 9, thus removing heat from an indoor space, as in air conditioning.
  • Liquid refrigerant in line 11 from outdoor coil 8 enters line 12 and passes through check valve 13 and a one-way filter F 1 . Cleaned liquid is discharged through a common line 14 to a control valve 17 and thence to a line 21 before entering indoor coil 9.
  • liquid refrigerant in line 11 from outdoor coil 8 enters line 12 and passes through check valve 13 and line 14 to enter a bi-directional filter-drier 30 of this invention within which contaminants are removed by an adsorption/filtration means. Cleaned liquid is discharged through line 24 to line 16 and through control valve 17 and line 21 before entering indoor coil 9.
  • liquid from indoor coil 9 moves through line 21, line 22, check valve 23, line 24, bi-directional filter-drier 30, line 14 line 26, control valve 27, and line 11 before entering outdoor coil 8.
  • the bi-directional filter-drier 30 which is shown in Figures 3 and 4 is of the reverse-discharge type. It comprises a shell consisting of a cylinder 31 and a pair of end closures 32, a pair of line connectors 33, an adsorption/filtration unit, and a retaining spring 37 which positions the adsorption/filtration unit against a positioning ring 38 within the enclosing shell.
  • the adsorption unit comprises an adsorption space filled with activated alumina or other adsorbent 35, a pair of valve assemblies 40, and a pair of pad assemblies 50.
  • Each valve assembly 40 comprises a valve bushing 41 having a valve seat 42 which surrounds a coaxial passageway therethrough, a valve ball 43, a valve spring 44, a bore retaining ring 48, and a valve screen 49.
  • Each pad assembly 50 comprises a perforated support plate 51 which annularly surrounds valve bushing 41 and rests against a shoulder thereof, a perforated support cup 52 which cooperatively fits against support plate 51 to form an enclosed annular space, a main filter pad 53 which fits within the enclosed space and annularly surrounds the valve bushing 41, a shaft-retaining ring 55 which positions the support plate 51 with respect to the valve bushing 41, a flexible diaphragm 57 which annularly surrounds the valve bushing 41 and moves to engage valve seat 45 formed on the outer end of bushing 41 to close off the perforated support cup 52, and a peripheral filter pad 54 which fits tightly against both cylinder 31 and support plate 51.
  • the diaphragm 57 in combination with the valve seat 45 forms a flapper-type check valve.
  • Each diaphragm 57 extends over the radial and longitudinal portions of cup 52 and also slightly overlaps plate 51. Diaphragms 57 also are each provided with a plurality of sealing rings 58 which position the pad assembly with respect to the inner surface of cylinder 31 and seal the adsorption space from the connectors 33. Diaphragms 57 are sufficiently flexible that they can be readily pushed away from cups 52 and diaphragm seat 45 to form an annular discharge portion for the cleaned liquid leaving the adsorption/filtration unit.
  • filter-drier 30 can be installed with either end connected to either outdoor coil 8 or indoor coil 9.
  • the bottom end of the filter-drier shown in Figures 3 and 4 will be assumed to be connected to line 14 in Figure 2, and the top end of the filter-drier shown in Figures 3 and 4 will be assumed to be connected to line 24 in Figure 2.
  • the flow path through this reverse-discharge type of bi-directional filter-drier may thus be described as inflow 61 moving through bottom connector 33) flow 62 moving between the lower valve seat 42 and valve ball 43, flow 63 moving through screen 49 at the inner end of the lower valve bushing 41, flow 64 moving through the bed of activated alumina and/or other desiccant or adsorbent 35, flow 65 moving through the upper filter pad 53, flow 66 moving between the raised diaphragm 57' and the ring-like diaphragm seat 45, and discharge flow 67 moving through top connector 33 and entering line 24 as shown in Figure 2.
  • a heat pump system which includes a separate-discharge bi-directional liquid-line filter-drier 90 is shown in Figure 5. Analyzing this heat pump system in its air-conditioning mode, liquid from outdoor coil 8 flows through line 71 into inflow line 74 and then into filter-drier 90. It discharges through line 76 and moves through control valve or other restrictive control device such as a capillary tube 77, which may be connected to a sensing means attached to indoor coil 9 for monitoring thereof, and then passes through line 81 to enter coil 9.
  • liquid moves through line 81, then through line 84 into filter-drier 90, next through line 86 and control valve 87 which is connected to sensing means attached to outdoor coil 8, and finally through line 71 to enter the outdoor coil.
  • This separate-discharge type of bi-directional filter-drier comprises a shell consisting of a cylinder 91 and'a pair of end closures 92, a pair of coaxially disposed line connectors 93, a pair of entrance tubes 96 which are slidable attached to the connectors 93, and a pair of annular discharge caps 94 which surround and are sealably attached to both connectors 93 and end closures 92, an adsorption/filtration unit, and a retaining spring 97 which in combination with a positioning ring 98 retains and positions the adsorption/filtration unit therebetween and within the shell.
  • Shell openings 99 in each end closure 92 connect the interior of the shell to the interiors of discharge caps 94.
  • the adsorption filtration/unit comprises an adsorption space filled with activated alumina or other desiccant 95, a pair of valve assemblies 100 and a pair of pad assemblies 110.
  • Each valve assembly 100 comprises a valve bushing 101 having a valve seat 102 which surrounds a coaxial passageway therethrough, a valve ball 103 which fits against valve seat 102, a valve spring 104 which seats ball 103 against valve seat 102, a bore retaining ring 108, and a valve screen 109 which is disposed athwart the inner end of the passageway.
  • Each pad assembly 110 comprises a perforated support plate 111 which annularly surrounds valve bushing 101 and rests against a shoulder thereof, a perforated support cup 112 which cooperatively fits against support plate 111 to form an enclosed annular space, a main filter pad 113 which fits within the enclosed space and circum- annularly surrounds the valve bushing 101, a shaft retaining ring 115 which holds support plate 111 against the shoulder of bushing 101, and a flexible diaphragm 117 which annularly surrounds entrance tube 96 and rests against both the annular diaphragm seat 105 and the radial surface of support cup 112.
  • Each diaphragm 117 extends over the radial and longitudinal portions of cup 112 and also slightly overlaps plate 111.
  • Each diaphragm 117 is also provided with a plurality of sealing rings 118 which position the pad assembly with respect to the inner surface of cylinder 91 and seal the adsorption space from the discharge cap 94. They are also sufficiently flexible that they can be readily pushed away from diaphragm seat 105 to form an annular discharge port therebetween but are sufficiently strong to function as a flapper-type check valve, preventing flow into the adsorption space through the adjacent filter pad 113.
  • top connector 93 is attached to line 84 from indoor coil 9 and bottom connector 93 is attached to line 74. Analyzing the flow passing through this separate-discharge embodiment 90 of the bi-directional filter-drier of this invention according to this assumption, liquid refrigerant leaves coil 9, moves through lines 81 and 84, and enters top connector 93 as flow 121, as shown in Figure 6.
  • filter-drier 30 can be fitted with one enterance tube 96, which is mounted within retaining spring 37, and with one shorter entrance tube (not shown in the drawings) in the end of the shell which is opposite to retaining spring 37.
  • the shell also must have the pair of annular discharge caps 94 and shell openings 99 in its end closures 32,
  • the filter-driers of this invention are designed to operate from a deep vacuum up to about 500 psi and their normal operating pressure is 100-400 psig.
  • the interior of the filter-driers needs no corrosion protection Ordinarily, the exterior need be protected from the atmosphere only, as with a corrosion-resistant paint.
  • the overall pressure differential across the filter-drier of this invention varies with the flow rate and the line sizes but is approximately equal to that of currently available filter-driers.
  • Springs 37, 97, 44, 104 are made of spring steel wire. 44 and 104 possess the minimum load characteristics that will provide a finite spring load when balls 43 and 103 are in the closed and seated position, in order to minimize pressure differentials across the filter-driers 30, 90,
  • Balls 43, 103 are preferably made of Nylon 66 and are very light, so that they are essentially weightless in the liquid refrigerant. Thus, spring loading with springs 44, 104 enables the filter-driers 30, 90 to be installed at any angle, including vertical.
  • Diaphragms 57, 117 are flexible and are preferably made of rubber. They must seat securely against the diaphragm seats 45, 105 of each valve bushing 41, 101 so that flows can be completely prevented in one direction.
  • Filter pads 53, 113, 54, 114 are preferably constructed of fiberglass.
  • Cylinders 31, 91 and closures 32, 92 of the shells can be made of a variety of materials, such as low-carbon steel, stainless steel, and brass.
  • Bushings 41, 101 are preferably made of steel but can be aluminum or brass.
  • Screens 49, 109 are preferably of low carbon steel but can satisfactorily be made of stainless steel or Monel.
  • Retainers 48, 55; 108, 115 are spring steel.
  • the entrance tubes 96 of the separate-discharge embodiment 90 can be unequal in length, and the tube disposed within spring 97 is the only tube which need be slideably attached to bushing 101 or connector 93.
  • Tubes 96 can be made of nylon or other strong plastics, stainless steel, or any other material of which lines 74, 84, are constructed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Compressor (AREA)
  • Drying Of Solid Materials (AREA)
  • Reciprocating Pumps (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Drying Of Gases (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
EP79300740A 1978-05-03 1979-05-01 Zweiweg Trocknungsfilter Expired EP0005599B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79300740T ATE1178T1 (de) 1978-05-03 1979-05-01 Zweiweg trocknungsfilter.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US05/902,398 US4177145A (en) 1978-05-03 1978-05-03 Two-way filter-drier for heat pump systems
US902398 1997-07-29

Publications (2)

Publication Number Publication Date
EP0005599A1 true EP0005599A1 (de) 1979-11-28
EP0005599B1 EP0005599B1 (de) 1982-06-09

Family

ID=25415809

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79300740A Expired EP0005599B1 (de) 1978-05-03 1979-05-01 Zweiweg Trocknungsfilter

Country Status (5)

Country Link
US (1) US4177145A (de)
EP (1) EP0005599B1 (de)
AT (1) ATE1178T1 (de)
BR (1) BR7902688A (de)
DE (1) DE2963059D1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991000484A1 (en) * 1989-07-04 1991-01-10 A'gramkow A/S Method and apparatus for recovery of volatile liquids such as refrigerants
EP0500420A1 (de) * 1991-02-13 1992-08-26 BACOT, Dominique Filterpatrone
EP0816779A1 (de) * 1995-03-17 1998-01-07 Hitachi, Ltd. Klimaanlage und feuchtigkeitsentfernvorrichtung zur anwendung bei der klimaanlage
EP2165127A1 (de) * 2007-05-16 2010-03-24 Carrier Corporation Kältemittelsammler
US20240009600A1 (en) * 2022-07-11 2024-01-11 The Hellen Strainer Company Automatic self-cleaning backwash strainer

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4272368A (en) * 1979-09-04 1981-06-09 Parker-Hannifin Corporation Fluid filter and indicator
US4637881A (en) * 1983-03-30 1987-01-20 Emerson Electric Co. Filter drier
US4474661A (en) * 1983-06-27 1984-10-02 Parker-Hannifin Corporation Filter dryer
US4954252A (en) * 1987-06-08 1990-09-04 Parker Hannifin Corporation Biflow filter drier
US4811571A (en) * 1988-03-28 1989-03-14 Thermo King Corporation Refrigerant drier
US5087355A (en) * 1990-07-19 1992-02-11 Godec C T Automatically self-flushing filter
US5580451A (en) * 1995-05-01 1996-12-03 Automotive Fluid Systems, Inc. Air conditioning refrigerant fluid dryer assembly
US5832741A (en) * 1996-10-18 1998-11-10 Eaton Corporation Filter/drier for reversible heat pump system
US6003511A (en) * 1996-11-18 1999-12-21 Medlis Corp. Respiratory circuit terminal for a unilimb respiratory device
US6235192B1 (en) 1997-03-20 2001-05-22 Parker-Hannifin Corporation Biflow drier with improved filtration
JP4047467B2 (ja) 1998-02-17 2008-02-13 東洋▲ろ▼機製造株式会社 キャニスタ用フィルタ装置
KR100371535B1 (ko) * 2000-11-03 2003-02-07 현대자동차주식회사 냉동사이클용 리시버 드라이어
ES2171146B1 (es) * 2001-01-19 2003-12-16 Membrane Concepts S L Sistema para el filtrado de fluidos, y filtro utilizado en este procedimiento.
US20030121842A1 (en) * 2001-08-21 2003-07-03 Membrane Concepts, S.L. Encapsulated filter unit, system and method for filtering fluids
US6835236B2 (en) * 2002-01-25 2004-12-28 Sporlan Valve Company Molded core filter drier with filter media molded to core
US6835235B2 (en) 2002-01-25 2004-12-28 Sporlan Valve Company Molded core filter drier with filter media molded to core for use in heat pump systems
US6852150B2 (en) * 2002-01-25 2005-02-08 Sporlan Valve Company Molded core filter drier
WO2003064941A1 (en) * 2002-01-25 2003-08-07 Sporlan Valve Company Molded core filter drier
KR100499506B1 (ko) * 2003-01-13 2005-07-05 엘지전자 주식회사 멀티공기조화기용 이물질 차단장치
DE102005046783A1 (de) * 2005-09-29 2007-04-05 Emerson Electric Gmbh & Co. Ohg Filtertrockner für zwei Durchflussrichtungen
US10436485B2 (en) * 2017-11-14 2019-10-08 Haier Us Appliance Solutions, Inc. Sealed system for a packaged terminal air conditioner unit
CN108759200A (zh) * 2018-07-03 2018-11-06 浙江恒利五金科技有限公司 一种汽车热泵空调系统用新型双向储液干燥过滤器
CN112665227B (zh) * 2019-10-15 2022-05-13 浙江盾安禾田金属有限公司 气液分离器及压缩系统
CN112665228B (zh) * 2019-10-15 2022-04-05 浙江盾安禾田金属有限公司 气液分离器及压缩系统
CN113883764B (zh) * 2021-11-08 2023-03-10 广东美芝制冷设备有限公司 储液器、压缩机组件及制冷设备

Citations (14)

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US2134413A (en) * 1937-05-20 1938-10-25 Munoz Alfred Filter assembly
US3029614A (en) * 1961-04-12 1962-04-17 Ed Friedrich Inc Refrigeration circuit for heat pumps
US3080977A (en) * 1960-05-06 1963-03-12 Henry Valve Co Drier fitting and assembly
US3178022A (en) * 1962-01-22 1965-04-13 Parker Hannifin Corp Bi-directional filter dryer for reverse cycle heat pumps
US3289841A (en) * 1962-12-26 1966-12-06 Michigan Dynamics Inc Bidirectional filter
US3299661A (en) * 1965-10-18 1967-01-24 Westinghouse Electric Corp Check valve manifolds for heat pumps
US3311454A (en) * 1964-01-09 1967-03-28 Westinghouse Electric Corp Apparatus for detection and measurement of contamination of sulfur hexafluoride and other gases
US3322281A (en) * 1964-08-07 1967-05-30 Gen Electric Filter assembly having plural check valves
US3545227A (en) * 1969-01-06 1970-12-08 Darwin R Grahl Receiver-dryer for refrigeration systems
DE1930082A1 (de) * 1969-06-13 1970-12-23 Willy Minnich Filter fuer ein Stroemungsmedium mit reversierbarer Stroemungsrichtung,insbesondere eine Fluessigkeit
US3731678A (en) * 1971-03-05 1973-05-08 Phyllis Pyzel Smoke inhalation protector
US3799347A (en) * 1971-09-27 1974-03-26 Duffie T Mc Bidirectional container for oil filter
US4045977A (en) * 1976-09-09 1977-09-06 Dunham-Bush, Inc. Self operating excess refrigerant storage system for a heat pump
US4125469A (en) * 1977-06-15 1978-11-14 Emerson Electric Co. Bi-directional filter drier

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US1539910A (en) * 1924-07-25 1925-06-02 Homer M Parish Water filter
US2896663A (en) * 1955-02-28 1959-07-28 Carl M Mena Check valve with valve seat of resilient material
US3265213A (en) * 1963-09-18 1966-08-09 Purolator Products Inc Filter assembly having the enclosure embedded in the bottom member
US3815752A (en) * 1972-03-02 1974-06-11 Sporlan Valve Co Refrigerant filter-drier
US4029580A (en) * 1976-10-05 1977-06-14 Sporlan Valve Company Bidirectional flow filter-drier

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2134413A (en) * 1937-05-20 1938-10-25 Munoz Alfred Filter assembly
US3080977A (en) * 1960-05-06 1963-03-12 Henry Valve Co Drier fitting and assembly
US3029614A (en) * 1961-04-12 1962-04-17 Ed Friedrich Inc Refrigeration circuit for heat pumps
US3178022A (en) * 1962-01-22 1965-04-13 Parker Hannifin Corp Bi-directional filter dryer for reverse cycle heat pumps
US3289841A (en) * 1962-12-26 1966-12-06 Michigan Dynamics Inc Bidirectional filter
US3311454A (en) * 1964-01-09 1967-03-28 Westinghouse Electric Corp Apparatus for detection and measurement of contamination of sulfur hexafluoride and other gases
US3322281A (en) * 1964-08-07 1967-05-30 Gen Electric Filter assembly having plural check valves
US3299661A (en) * 1965-10-18 1967-01-24 Westinghouse Electric Corp Check valve manifolds for heat pumps
US3545227A (en) * 1969-01-06 1970-12-08 Darwin R Grahl Receiver-dryer for refrigeration systems
DE1930082A1 (de) * 1969-06-13 1970-12-23 Willy Minnich Filter fuer ein Stroemungsmedium mit reversierbarer Stroemungsrichtung,insbesondere eine Fluessigkeit
US3731678A (en) * 1971-03-05 1973-05-08 Phyllis Pyzel Smoke inhalation protector
US3799347A (en) * 1971-09-27 1974-03-26 Duffie T Mc Bidirectional container for oil filter
US4045977A (en) * 1976-09-09 1977-09-06 Dunham-Bush, Inc. Self operating excess refrigerant storage system for a heat pump
US4125469A (en) * 1977-06-15 1978-11-14 Emerson Electric Co. Bi-directional filter drier
DE2826251A1 (de) * 1977-06-15 1978-12-21 Emerson Electric Co In zwei richtungen arbeitender filtertrockner

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991000484A1 (en) * 1989-07-04 1991-01-10 A'gramkow A/S Method and apparatus for recovery of volatile liquids such as refrigerants
EP0500420A1 (de) * 1991-02-13 1992-08-26 BACOT, Dominique Filterpatrone
EP0816779A1 (de) * 1995-03-17 1998-01-07 Hitachi, Ltd. Klimaanlage und feuchtigkeitsentfernvorrichtung zur anwendung bei der klimaanlage
EP0816779A4 (de) * 1995-03-17 1998-08-05 Hitachi Ltd Klimaanlage und feuchtigkeitsentfernvorrichtung zur anwendung bei der klimaanlage
EP2165127A1 (de) * 2007-05-16 2010-03-24 Carrier Corporation Kältemittelsammler
EP2165127A4 (de) * 2007-05-16 2013-03-27 Carrier Corp Kältemittelsammler
US20240009600A1 (en) * 2022-07-11 2024-01-11 The Hellen Strainer Company Automatic self-cleaning backwash strainer

Also Published As

Publication number Publication date
DE2963059D1 (en) 1982-07-29
ATE1178T1 (de) 1982-06-15
BR7902688A (pt) 1979-11-27
EP0005599B1 (de) 1982-06-09
US4177145A (en) 1979-12-04

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